Chapter 20
20.2.rate 4.06 10 ^7 mol/s
20.3.All rates are 406 10 ^7 mol/s
20.4.rate (1.12 10 ^4 M^2 s^1 )[A]^2 [B]^1 [C]^0
20.7.rate (3.34 10 ^2 M^1 s^1 )[A]^1 [B]^1
20.8.[A] 1.33 10 ^2 M
20.9.M^3 s^1
20.12.35.2 s
20.13. (a)32.4 s (b)356 s
20.14. (a)32.7 s (b)397 s
20.17.dd[tA]k[A]^3 ; 2[^1 A]
t^22[^1 A] 2
0kt; plot 2[^1 A]
t^2vs. t,slope kand intercept 2[^1 A] 2
0
.20.18. (a)t1/2
2 k[3
A]^20(b)t1/23[
8A
k]^20
20.19.slope k; intercept [A] 0
20.21.t[A
k
] 020.26.slope k/2.303
20.28.K2.9 101
20.31.Initial ratio of (A B)/(B C) 8.98. Equilibrium
ratio cannot be determined without knowing the rates of the
reverse reactions.
20.33.slope (k 1 k 2 )
20.43.EA51.9 kJ
20.44.A1.2 1055 s^1
20.45.A1.21 10 ^11 s^1
20.46. (a)order 2 (b)k(100°C) 2.08 10 ^6 M^1 s^1
20.49. (a)EA159 kJ/mol (b)A1.8 1038 s^1
20.60.V2.6 10 ^6 mol/s
20.63.I 2 should proceed most easily.
Chapter 21
21.6. (a)3 unit cells (b)2 unit cells (c)6 unit cells (d) 1
unit cell (See Table 21.1 for the crystal systems that fit the
given requirements.)
21.9.rmax( 3
4)a
21.12.4 formula units; face-centered cubic
21.13.FeS 2
21.14.d2.784 g/cm^3
21.21.8.2° and 16.5°
21.22.12.3° (or 25.2° or 39.7° or 58.5°)
21.23.NA6.0320 1023
21.30. (a)15.5°(b)22.3°
21.31.fcc, a4.933 Å
21.32.KBr diffracts the given X rays at 11.7°, 13.5°,
19.3°, 22.8°, 23.9°, and 27.9°.
21.35.The sample couldbe MgO, since the ions in this com-
pound are isoelectronic and would have similar scattering
factors.
21.36. (a)fcc, NaCl-type (b)sc (c)sc
21.37. (a)rutile (b)fluorite (c)rutile
21.40.coordination number 8
21.41.coordination number (Ca, fluorite) 8, coordination
number (F, fluorite) 4; coordination number (Ti, rutile) 6,
coordination number (O, rutile) 3.
21.43. (a)K(g) F(g) →KF (crystal)
21.46. (a)399 kJ/mol (coulombic) vs. 636 kJ/mol (lattice
energy)
21.47."0.307 ÅChapter 22
22.2.4.355 105 dyn/cm
22.3. (a)1.36 10 ^4 J
22.6. (a) T10.8°C
22.7.
~4 10 ^2 erg/cm^2
22.15. (a)9600 dyn/cm^2 0.72 torr
22.18. (b)pvapor25.06 mmHg
22.20.49.9°
22.24. (a)3.988 Å
22.30.3.54 108 molecules of gas per cubic centimeter
22.31.~0.01 s
22.32.7.5 108 L
22.33. (a)heterogeneous (b)heterogeneous (c)homogeneousChapter 22 815